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Related Experiment Videos

Practical methods for the microbial validation of sterilizing-grade filters used in aseptic processing.

W D MacDonald, C A Pelletier, D L Gasper

    Journal of Parenteral Science and Technology : a Publication of the Parenteral Drug Association
    |November 1, 1989
    PubMed
    Summary

    New microbial challenge test methods validate sterilizing-grade filters for parenteral drug products. Scaled-down systems using Pseudomonas diminuta confirmed 0.22-micron filter integrity for process validation.

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    Area of Science:

    • Pharmaceutical Science
    • Microbiology
    • Filtration Technology

    Background:

    • Parenteral drug products require validated sterilizing-grade filters for safe administration.
    • Existing methods may not fully represent customer processing conditions.
    • Development of scalable and representative challenge test methods is crucial.

    Purpose of the Study:

    • To develop and validate microbial challenge test methods for sterilizing-grade filters.
    • To simulate customer processing parameters (flow rates, pressure, temperature, duration).
    • To facilitate the use of parenteral drug products as liquid vehicles.

    Main Methods:

    • Development of scaled-down filtration systems using 47 mm disc filter holders.
    • Utilized a peristaltic pump for positive pressure and a filter sampling manifold.

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  • Challenged 0.22-micron and 0.45-micron polyvinylidene difluoride (PVDF) filters with Pseudomonas diminuta (ATCC 19146).
  • Resuspended microorganisms in pharmaceutical products at concentrations ≥10(7) CFU/cm².

    • Main Results:

    • The developed system accommodated various flow rates while maintaining microorganism viability.
    • 0.22-micron sterilizing-grade filters demonstrated complete retention of Pseudomonas diminuta.
    • 0.45-micron membranes showed expected bacterial passage.

    Conclusions:

    • The developed microbial challenge test method effectively validates sterilizing-grade filters.
    • The method simulates real-world processing conditions for parenteral drug manufacturing.
    • Results support the use of these filters and provide data for process validation documentation.